Related Experiment Videos
Synthesis of macrocyclic, potential protease inhibitors using a generic scaffold
Estelle Dumez1, John S Snaith, Richard F W Jackson
1Exploratory Medicinal Sciences, Pfizer Global Research and Development, Groton, Connecticut 06340, USA.
The Journal of Organic Chemistry
|July 6, 2002
Summary
Researchers designed macrocyclic peptides as potential proteinase inhibitors. However, none of the synthesized compounds inhibited target enzymes, with one even acting as a substrate, indicating insufficient entropic advantage.
Area of Science:
- Medicinal Chemistry
- Biochemistry
- Molecular Modeling
Background:
- Proteinases are crucial enzymes involved in various biological processes.
- Inhibiting proteinases is a key strategy for developing therapeutics.
- Macrocyclic peptides offer potential advantages as enzyme inhibitors due to reduced entropic penalty.
Purpose of the Study:
- To design and synthesize novel macrocyclic peptides as potential inhibitors of proteinases.
- To explore the structure-activity relationship by varying the P(1) group for enzyme class specificity.
- To evaluate the inhibitory potential of designed macrocyclic peptides against target enzymes.
Main Methods:
- Molecular modeling was used to identify a benzoxazole linking group to preserve peptide conformation.
- Synthesis involved Pd-catalyzed coupling and macrocyclization using HATU.
- Inhibition assays, Nuclear Magnetic Resonance (NMR), and Mass Spectrometry (MS) were employed to assess compound activity and interactions.
Main Results:
- None of the synthesized macrocyclic compounds (25, 28-30, 32) demonstrated inhibition against their target proteinases.
- NMR and MS studies revealed that macrocycle 29 was a substrate, not an inhibitor, of chymotrypsin.
- The macrocyclic design, while achieving binding, did not provide sufficient entropic advantage for inhibition.
Conclusions:
- The designed macrocyclic peptides failed to inhibit target proteinases.
- The macrocyclic structure did not sufficiently reduce the entropic penalty for hydrolysis.
- Further optimization is needed to develop effective macrocyclic proteinase inhibitors.